E51 ICD-10-CA category: Thiamine deficiency
E51 isn’t a code on its own. Choose one of the 4 codes beneath it, the one the documentation supports.
Official description
E51Thiamine deficiency
ICD-10-CA · Canada
Codes in E51
E51 isn’t a code on its own. Open the code that matches what the note documents.
Notes for E51
As CIHI prints them, with any note E51 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Sequelae of thiamine deficiency (E64.8)
- Nutritional anaemias (D50-D53)From E50-E64 Other nutritional deficiencies
- Complications of pregnancy, childbirth and the puerperium (O00-O99)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)transitory endocrine and metabolic disorders specific to fetus and newborn (P70-P74)From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Note
- All neoplasms, whether functionally active or not, are classified in Chapter II. Appropriate codes in this chapter (i.e. E05.8)(E07.0) (E16-E31)(E34.-) may be used, if desired, as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.From Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
Where E51 sits
- 1ChapterChapter 4: Endocrine, nutritional and metabolic diseases (E00-E90)
- 2Block E50-E64Other nutritional deficiencies
- 3Category E51Thiamine deficiency
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is E51 a valid ICD-10-CA code?
No. E51 (Thiamine deficiency) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 4 codes; record the one the documentation supports.
Where is E51 in ICD-10-CA?
E51 sits under E50-E64 Other nutritional deficiencies, within Chapter 4: Endocrine, nutritional and metabolic diseases (E00-E90).
What coding notes apply to E51?
ICD-10-CA lists Excludes, Note notes for E51, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside E51
View E50-E64E50Vitamin A deficiencyE52Niacin deficiency [pellagra]E53Deficiency of other B group vitaminsE54Ascorbic acid deficiencyE55Vitamin D deficiencyE56Other vitamin deficienciesE58Dietary calcium deficiencyE59Dietary selenium deficiencyE60Dietary zinc deficiencyE61Deficiency of other nutrient elementsE63Other nutritional deficienciesE64Sequelae of malnutrition and other nutritional deficiencies